Udc
abbr. 国际十进位分类（universal decimal classification）
🗣️ 情景例句
Be careful not to drink the water in__.
小心点儿，不要乱喝水。
It is a wise father that knows his own child.
父贤知其子。
They are arguing over who should pay the bill.
他们为谁应该付款而争论不休。